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Revenue Recognition - Unbilled Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 01, 2017 | Apr. 02, 2016 | Dec. 31, 2016
Roll forward of the unbilled receivables allowance |  |  |
Balance at beginning of period | $ 1,720 | $ 2,354 | $ 2,354
Increases to reserves | 884 |  | 2,102
Amounts written off | (242) |  | (2,736)
Balance at end of period | 2,362 |  | $ 1,720
Reimbursable expenses | $ 9,140 | $ 8,030 |

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- Definition Represents the valuation allowance for unbilled service receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References No definition available. + Details
Name: | crai_AllowanceForUnbilledServices
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amounts of increase (decrease) as a result of the amount written off on allowance for unbilled services. + References No definition available. + Details
Name: | crai_AllowanceForUnbilledServicesAmountsWrittenOff
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amounts of increase (decrease) as a result of Increases to reserve on allowance for unbilled services. + References No definition available. + Details
Name: | crai_AllowanceForUnbilledServicesIncreasesToReserves
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | crai_AllowanceForUnbilledServicesRollForward
Namespace Prefix: | crai_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=51671805&loc=d3e60722-111653 + Details
Name: | us-gaap_ReimbursementRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration